“What are normal ECG values?”

There are many resources online that you can use to assess your ECG but I do recommend leaving it up to a specialist to have your results properly interpreted.

I haven't been reading anywhere from 10 to 200 EKGs daily for 40 years. There are all levels of understanding. Basic skills are taught to paramedics and first responders, more details to the ER doctor, the internal medicine and hospital doctors have much more knowledge about EKGs and cardiologists know quite a bit but it is the cardiac electrophysiologist that is responsible for understanding all of the details. Certainly there are a lot of books available and online material. If you really want to know though you have to study.

Hi Please check the attached web link, hope that will help you to understand a little bit of EKG.
https://ecglibrary.com/norm.php

There is variation, but the range can be:

-HR 60-90 beats per minutes
-PR interval 130-200 msec
-QRS 80-110 msec
-QTc 360-440 msec

Again, there are lots of variations.